"The Wait Operation Timed Out" in File Explorer (0x80070102): Every Fix

"The wait operation timed out" (error 0x80070102) in File Explorer means a folder, file or drive did not answer in time. It most often appears when opening a Pictures or Videos folder full of media, a network or cloud folder, or a failing drive. Quick fixes: restart Windows Explorer from Task Manager, clear the thumbnail cache with Disk Cleanup, and set the folder to Optimize this folder for: General items in its Properties. If it is a network folder, reconnect or map it again; if it is a USB or internal drive, check its health. Here is what most guides miss: one damaged photo or video can freeze a whole folder, because File Explorer waits for it while making thumbnails. Turning thumbnails off for a moment tells you within seconds whether that is your problem.

Ethan's sister keeps twelve years of family photos and phone videos in one Pictures folder: tens of thousands of files. One evening, opening it froze File Explorer for a minute, then showed "The wait operation timed out". It happened again every time. She assumed the drive was dying. At Jake's shop the first test took ten seconds: switch File Explorer to show icons instead of thumbnails. The folder opened instantly. One corrupted video from an old phone was hanging the thumbnail generator. Jake found it, moved it to a separate folder, cleared the thumbnail cache, and turned thumbnails back on. Everything worked, and the drive was healthy. This page walks through every cause, from the quick ones to the serious ones, in the order that finds them fastest.

None of the quick fixes delete your files. The thumbnail cache is only previews Windows creates; clearing it is safe, and Windows rebuilds it as you browse.

What causes "The wait operation timed out"

Work down the table from the row that matches where you see the error; the first two rows explain the large majority of cases on home PCs.

Restart Windows Explorer first

1. Press Ctrl + Shift + Esc to open Task Manager.
2. On the Processes tab, find Windows Explorer.
3. Right-click it and choose Restart.
4. The taskbar and open folders disappear for a moment, then return.

Then open the folder again. If the error was a one-off hang, this clears it. If it returns every time you open the same folder, the cause is in that folder, and the next sections find it. Our guide to restarting Explorer has more detail.

If the taskbar does not come back after restarting Explorer, open Task Manager again, choose Run new task, type explorer.exe, and press Enter.

Restarting Explorer also clears its memory of slow network locations it was waiting on, which is why it often fixes a hang that started after the Wi-Fi briefly dropped.

Test with thumbnails turned off

1. Open File Explorer, click the three dots > Options (Windows 10: View > Options).
2. On the View tab, check Always show icons, never thumbnails, and click OK.
3. Open the problem folder again.

If the folder now opens quickly, thumbnail generation is the cause: a damaged image or video, a missing codec, or a stale thumbnail cache. Clear the cache and look for the problem file, as below, then turn thumbnails back on. If the folder is still slow with icons only, the cause is elsewhere: the folder type, the drive, the network or a shell extension.

On a slower PC, you can also leave thumbnails off permanently for specific heavy folders by using the Details or List view there, which shows no previews and opens fastest.

Clear the thumbnail cache

1. Press the Windows key, type Disk Cleanup, and open it.
2. Choose the system drive, usually C:, and click OK.
3. Check Thumbnails (you can clear the others), and click OK, then Delete Files.

Alternatively, in Settings, open System > Storage > Temporary files, check Thumbnails and click Remove files. Windows rebuilds thumbnails as you browse, which can make folders slow for a few minutes the first time. A damaged cache can cause timeouts and wrong or blank previews; clearing it fixes both.

Some third-party cleaning tools clear thumbnails every day, which makes folders slow every morning as Windows rebuilds them; if you use one, exclude thumbnails from its cleanup.

You can also clear only one folder's thumbnails by moving its files to a new folder and back, which forces fresh previews, though clearing the whole cache is simpler and quick.

Find the damaged photo or video

With thumbnails turned back on, open the folder in Details view and watch which file's icon stays blank while Explorer hangs; it is usually the culprit. In big folders, split the search: move half the files into a new subfolder, open each half, and keep halving the one that hangs until you find the file. Common culprits are videos from old phones or cameras that were interrupted while recording, partly downloaded files, and files copied from failing memory cards. Move the bad file to a separate folder, try opening it in a media player such as the Photos app or VLC, and delete it only if it is truly broken and you have another copy.

Image files can also be the culprit: very large panoramas, files from scanners saved in unusual formats, or photos partly copied when a card was removed early. The same halving method finds them. If a damaged file matters to you, keep it in a separate folder and try a dedicated recovery or repair tool later, after the rest of your folder is working again.

Missing codecs and HEIC thumbnails

Windows needs a codec to read each media format. Photos from recent iPhones (HEIC) and videos in HEVC need the HEIF Image Extensions and HEVC Video Extensions from the Microsoft Store; without them, thumbnails may stay blank or slow. Avoid installing large third-party codec packs to fix this; they replace Windows components, often install shell extensions, and are a frequent cause of Explorer hangs themselves. If you installed one in the past and folders time out, uninstalling it is a good test.

After installing the extensions, clear the thumbnail cache once so Windows regenerates previews for files that previously failed.

Videos recorded by drones, action cameras and security cameras sometimes use formats Windows cannot preview at all; for those, the camera maker's app or a dedicated player is the right tool, and General items keeps the folder fast.

Change the folder type to General items

Windows guesses each folder's type and, for Pictures and Videos types, reads details such as dimensions, dates and length from every file, which takes a long time in folders with thousands of items. To speed it up:

1. Right-click the folder and choose Properties.
2. Open the Customize tab.
3. Set Optimize this folder for to General items.
4. Check Also apply this template to all subfolders if the subfolders are large too, and click OK.

The folder opens much faster and still shows thumbnails; only the extra columns of media details are skipped. This setting alone often fixes timeouts on Downloads folders full of mixed files.

Folder type settings belong to each folder, so a large Downloads or Videos folder may need it set separately from Pictures.

The five folder types, explained

Windows picks a type automatically from the files inside, which is why a Downloads folder full of videos can suddenly behave like a slow Videos folder. Setting the type by hand stops Windows guessing. Thumbnails still appear for every type; only the extra columns change.

To set many folders at once, set the parent folder's type and check Also apply this template to all subfolders.

Network shares and NAS drives

• Check the connection: open the share's address directly, such as \\NAS\Photos, or ping the device. Wi-Fi drops and sleeping NAS drives are common causes.
• Wake the NAS: many NAS devices spin down their disks when idle; the first access takes several seconds, which can time out. Open the NAS's web page once, or adjust its sleep settings.
• Credentials: a hidden sign-in prompt can stall the connection. Remove old saved credentials in Credential Manager > Windows Credentials and reconnect.
• Remap the drive: disconnect the mapped drive and map it again with Map network drive, checking Reconnect at sign-in.
• Offline files: an old Offline Files sync can conflict; check Sync Center from Control Panel and turn Offline Files off if you do not use it.

On Wi-Fi, a weak signal makes network folders time out long before websites seem slow; try a wired connection or move closer to the router to test.

Slow pinned network folders in Quick access

Network folders pinned to Quick access or Home are checked every time File Explorer opens. When the network location is unavailable, such as a work share while you are at home, File Explorer can hang for a while before showing anything. Unpin network folders you do not use daily, or switch File Explorer to open to This PC under Folder Options > General > Open File Explorer to. Ethan's sister had a pinned folder from her old office; removing it made File Explorer open instantly again.

Mapped drives that point to unavailable servers have the same effect on This PC; disconnect any you no longer use.

OneDrive and cloud folders

In OneDrive folders, opening a file or generating its thumbnail can trigger a download of online-only files, which times out on slow connections. Check the OneDrive cloud icon on the taskbar: paused, signed out or stuck sync causes delays. For folders you browse often, right-click and choose Always keep on this device so files are local. If OneDrive itself is struggling, restart it from the cloud icon's menu, or reset it with %LocalAppData%\Microsoft\OneDrive\onedrive.exe /reset. Our guide to OneDrive covers the sync icons.

Also check OneDrive's Files On-Demand status column in Details view; a folder full of cloud icons will always be slower to preview than local files.

If OneDrive shows sync errors, fix those first; a stuck sync can lock files that Explorer is trying to read.

Check the drive's health

If timeouts happen on a particular drive, especially an external hard drive or an old internal one, the drive may be failing. Signs include clicking or grinding noises, files that take minutes to open, and copy errors. Back up important files first, before running long tests that stress the drive. Then check health in Settings > System > Storage > Advanced storage settings > Disks & volumes, the drive maker's tool, or Event Viewer's System log for Disk errors such as event 7 or 153. Run chkdsk X: /scan in Terminal (Admin) to check the file system online. A drive with warnings should be replaced.

Copy the most important files first, such as documents and irreplaceable photos, then the rest. A failing drive can stop working completely at any moment, so the order matters.

USB drives and memory cards

Cheap USB sticks and worn SD cards slow down dramatically as they age, and card readers can drop connections. Try another USB port, preferably directly on the PC rather than a hub, and another cable for external drives. Copy the files off to a healthy drive, then work from the copy. Avoid opening huge folders of photos directly from a memory card; import them with the Photos app or copy them first, which is faster and safer.

For SD cards from cameras, a dedicated card reader is usually faster and more reliable than connecting the camera itself by USB.

Format a worn card only after copying everything off; if it still performs badly after formatting, replace it, since flash media wears out with use.

Timeouts that start after a Windows update

If folders started timing out right after an update, check whether the update changed something they depend on: a graphics driver that renders thumbnails, a codec or a cloud app. Restart once more, since some updates finish on the second restart. If the problem persists and others report the same with that update, uninstall it from Settings > Windows Update > Update history > Uninstall updates and pause updates for a week while a fix arrives.

Note the date the problem began; Reliability Monitor shows updates installed on that day, which makes the connection easy to confirm.

Test in a new user account

Some causes live in your user profile: a damaged thumbnail cache, Quick access pins, or per-user shell extensions. Create a test account under Settings > Accounts > Other users, sign in, and open the same folder, browsing to it through This PC. If it opens normally there, the problem is in your profile; clearing caches, unpinning network folders and checking per-user startup apps in your own account usually fixes it.

Delete the test account afterward, so it does not linger with an empty profile and its own startup items.

If the folder also times out in the new account, the cause is system-wide or in the folder itself, so go back to the folder, drive and network checks.

Error 0x80070102 when copying files

The same message, with code 0x80070102, can appear during copies. Copy in smaller batches, close other apps using the files, and for large transfers use robocopy "source" "destination" /E /R:2 /W:5 in Terminal, which retries files that stall and reports exactly which one fails. If the same file fails every time, it is likely damaged on the source; if every file fails at random, check the destination drive or network connection.

When copying to a NAS or network share, also check the destination has free space and that no backup job is writing to it at the same time.

Very long paths and file names

Files buried deep in folders with long names can exceed the traditional 260-character path limit, and some operations on them stall or fail with timeouts or vague errors. Shorten folder names, move deep folders closer to the drive root, or extract archives to a short path such as C:\Temp. Windows 11 can enable long path support for apps that use it, through the Enable Win32 long paths policy or the LongPathsEnabled registry value, but File Explorer itself still prefers shorter paths, so shortening is the reliable fix.

Archives downloaded from the internet are the usual source of absurdly deep folders; extracting them close to the drive root avoids most of these problems.

Synced folders add their own length to every path, so deep folders inside OneDrive reach the limit sooner than the same folders stored at the root of a drive.

Copy files out of a folder that will not open

If a folder keeps timing out and you need its contents now, bypass File Explorer. In Terminal, run robocopy "D:\Photos" "E:\Rescue" /E /R:1 /W:1 to copy everything it can, skipping files that do not respond quickly; the summary lists any it could not copy. The Photos app's Import or a backup tool can also read folders that Explorer struggles to display. Once your files are safe, troubleshoot the original folder at leisure.

Copy to a different physical drive if you suspect the original is failing, so the rescue does not depend on the same hardware.

Turn off the Preview and Details panes

The Preview pane (Alt + P) and Details pane (Alt + Shift + P) load the selected file's contents or properties, and a slow or damaged file can hang them. Press the shortcut again to close the pane, or use View > Show and clear the pane. PDF and Office previews depend on their apps' preview handlers; if one type of file always hangs the preview, update or repair that app.

Some PDF readers install preview handlers that are slow with large files; switching the default PDF app, or turning off its preview option, often fixes hangs on PDF-heavy folders.

Closing the panes also makes File Explorer faster in general on modest PCs, so leave them off unless you use them daily.

Shell extensions and clean boot

Programs add context-menu items and thumbnail handlers to File Explorer, called shell extensions. A buggy one, often from older archive tools, cloud storage apps or media codecs, can make folders time out. Test with a clean boot: if folders open normally, re-enable startup items in groups to find the program, then update or uninstall it. Safe Mode is another quick test, since most third-party extensions do not load there.

Once you know which program is responsible, check for an update first; many vendors have fixed Explorer hangs in newer versions.

Uninstall cloud storage apps you no longer use too; each adds overlays and extensions that File Explorer loads for every folder.

Repair system files

If timeouts happen everywhere and nothing above helps, repair Windows' files. In Terminal (Admin), run DISM /Online /Cleanup-Image /RestoreHealth, then sfc /scannow, and restart. This fixes damaged system components that File Explorer depends on.

Restart after both commands finish, even if they report no problems, so any repaired components load fresh. If SFC reports files it could not repair, run DISM again with a working internet connection, then SFC once more.

System file damage rarely affects just one folder, so if only a single folder times out, the cause is almost certainly something in that folder rather than Windows itself.

Rebuild the icon cache too

Separate from thumbnails, Windows keeps an icon cache for program and file-type icons. A damaged icon cache causes blank or wrong icons and occasionally slow folders. To rebuild it, open Terminal, run taskkill /f /im explorer.exe, then del /a %LocalAppData%\Microsoft\Windows\Explorer\iconcache* in Command Prompt, and start Explorer again with explorer.exe, or simply restart the PC. Windows recreates the cache automatically.

Rebuilding the icon cache is harmless; the only side effect is that icons take a moment to appear the first time you open folders afterward.

If icons stay wrong after rebuilding, the app that owns those file types may need repairing, since its icons are read from its files.

Launch folder windows in a separate process

In File Explorer Options > View, check Launch folder windows in a separate process. Each folder window then runs separately, so one hanging folder does not freeze the taskbar and every other window. It uses a little more memory, which modern PCs handle easily, and makes timeouts far less disruptive while you find the cause.

Leave it on permanently if you often work with network or cloud folders; the stability benefit is worth the small memory cost.

It also means a crashing folder window closes on its own without taking the taskbar and desktop with it.

The option takes effect the next time you open a folder window, or after restarting Explorer; nothing else changes about how folders look or work.

When search makes it worse

Searching inside a folder with thousands of files, on a drive that is not indexed, can make File Explorer wait so long it times out. Add the folder to the search index, as our guide to rebuilding the search index explains, so searches answer from the index instead of reading every file. If File Explorer crashes outright when searching, see our guide to Explorer crashing on search.

For very large archives you rarely search, it is better to leave them out of the index and browse by folder, keeping the index small and fast.

A quick alternative for finding files by name in huge folders is the search box with a name: filter, which skips reading file contents and returns much sooner.

Antivirus scanning delays

Security software scans files as File Explorer reads them, and some third-party suites slow large media folders considerably. Test by pausing real-time protection briefly and opening the folder; if it is suddenly fast, update the suite, add an exclusion for the large media folder if you trust its contents, or switch to Microsoft Defender, which handles this well. Turn protection back on immediately after testing.

Scheduled full scans running in the background have the same slowing effect; check whether your antivirus scans at the times folders seem slow, and move the schedule to a quieter time.

Microsoft Defender also offers a scan of a single folder from its right-click menu, which is useful to confirm a suspicious file in a slow folder is not malware before you open it.

Clues in Event Viewer

If the cause is still unclear, open Event Viewer > Windows Logs > System and look for Disk, Ntfs or storahci warnings at the times folders timed out; they point to the drive or its connection. In Application, Application Hang entries for explorer.exe sometimes name the module that was busy, such as a codec or a cloud app's extension. A pattern of disk errors means back up now; a pattern naming one program means update or remove it.

Event Viewer's Reliability Monitor (perfmon /rel) shows the same hangs as red crosses on a timeline, which is an easier first look.

Copy any error codes from these entries; searching the code together with the source name usually points to a precise fix rather than general advice.

The same message in other apps

"The wait operation timed out" also appears in other programs, especially database and business apps, where it means the program waited too long for a server or database. Those cases have nothing to do with File Explorer; the fix lies with the server or the app's settings, so contact the app's support or your IT team. This page covers the Windows File Explorer message, which appears when opening folders and copying files.

If the message appears inside an app such as an accounting program, note the exact wording and time and send it to the app's support; their logs can match it to a server problem.

Outlook can show a similar wait when its data file sits on a network drive or in a OneDrive folder; keeping Outlook data files on the local drive avoids that, and Microsoft recommends exactly that setup.

Organize big media folders

The long-term fix for huge folders is organization. Split one folder of 40,000 photos into subfolders by year or event; File Explorer opens a folder of a few thousand files far faster. The Photos app can show everything together regardless of folders, so you lose nothing by organizing. Ethan's sister now has a folder per year, and none of them takes more than a second to open.

Moving files between folders on the same drive is instant, so reorganizing even a huge collection takes minutes, not hours.

Name subfolders consistently, such as "2024-08 Beach trip", so they sort by date automatically and stay easy to browse.

Pictures library vs Pictures folder

Windows has a Pictures folder in your user profile and a Pictures library, which can combine several folders, including ones on other drives or the network. If the library includes a folder on a disconnected drive or an unreachable share, opening it waits for that location and may time out. Right-click the library in the navigation pane (with Show libraries on), choose Properties, and remove locations that no longer exist.

Libraries are hidden by default on Windows 11; turn them on with right-click in the navigation pane, Show libraries, to check them.

OneDrive's folder backup can also change where the Pictures library points, to the OneDrive copy; if OneDrive is unlinked, the library may point to a folder that no longer exists, which causes exactly this timeout until you fix its locations.

Disk at 100% in Task Manager

If folders time out while Task Manager's Performance tab shows the disk at 100%, something else is saturating it: Windows Update, the search indexer, antivirus scans, OneDrive sync or a backup. On older hard drives this is common and makes everything wait. Sort Task Manager's Processes by Disk to see the cause, let updates finish, and consider moving Windows to an SSD, which removes most of these waits entirely.

Waiting a few minutes after starting the PC, while updates and indexing settle, often makes folders open normally on older machines.

On laptops, plugging in during heavy activity also helps, since some PCs throttle disk and processor speed on battery.

Why old hard drives time out more

A spinning hard drive can read only one place at a time, and generating thousands of thumbnails means thousands of separate reads. An SSD handles many reads at once and has almost no delay between them. On a PC with a hard drive, large media folders are simply much slower, and any extra activity pushes them past the timeout. Keeping media folders organized, setting them to General items and, where possible, upgrading to an SSD are the lasting fixes.

A hard drive that has become much slower than it used to be may also be failing; check its health before blaming age alone.

A second hard drive that falls asleep

Windows turns off idle hard drives to save power, and a sleeping drive takes several seconds to spin up when you open a folder on it, which can be long enough to time out. Open powercfg.cpl, click Change plan settings > Change advanced power settings, expand Hard disk > Turn off hard disk after, and set a longer time, such as 60 minutes, or 0 for never on a desktop. External USB drives often have their own sleep timer in the maker's utility. SSDs do not spin, so this only applies to traditional hard drives.

To confirm this is the cause, open the folder twice in a row: if the first attempt times out and the second, a moment later, opens instantly, the drive was simply waking up. Lengthening the sleep timer, or keeping the drive's contents on an SSD, makes the problem disappear.

Huge ZIP files opened in File Explorer

File Explorer can open ZIP files like folders, but it reads them slowly, and very large archives, especially with thousands of files, can hang it. Right-click the ZIP and choose Extract All to a short path, then browse the extracted folder. Windows 11 also opens 7z, RAR and TAR archives on current versions, with the same caution for large ones. For huge archives you use often, keeping them extracted is faster in every way.

Opening a file directly from inside a ZIP also extracts it to a temporary folder each time, which is slower and can leave edits unsaved; extracting first avoids both problems.

Phones and cameras connected by USB

Browsing a phone's storage in File Explorer uses a slower media transfer connection, and large DCIM folders often time out. Keep the phone unlocked, set its USB mode to File transfer, and use a good cable directly in the PC. Better still, use the Photos app's Import, or the phone's own backup to OneDrive or Google Photos, which handle thousands of files reliably. Browse the copied photos on the PC rather than on the phone.

If the phone disappears from This PC partway through browsing, its screen probably locked; set a longer screen timeout on the phone while transferring.

Encrypted and locked drives

A BitLocker-encrypted external drive that is locked shows a padlock and asks for a password; until it is unlocked, folders on it cannot open. If it is unlocked but slow, encryption itself is rarely the cause on modern PCs; check the drive and its connection as for any other drive. After unlocking, give Windows a moment before opening large folders on very old drives.

If an encrypted drive asks for its password every time, check Automatically unlock on this PC in its BitLocker options, which unlocks it silently on your own PC.

For IT admins: timeouts on file shares

Shares. SMB timeouts on large shares often come from antivirus scanning on the server, slow storage, or oversized folders. Enable Access-based Enumeration where appropriate, keep share folder sizes reasonable, and check server-side scanning exclusions.

Clients. Folder redirection and Offline Files are frequent sources of client-side timeouts; review their policies, and prefer OneDrive Known Folder Move where possible.

Endpoints. Third-party codec packs and old archive tools are worth removing from standard images; they cause more Explorer stability tickets than almost anything else.

Keep a short checklist for the service desk: restart Explorer, thumbnails off test, folder type, then drive and network checks.

Keep it from coming back

• Organize big media collections into subfolders by year or event.
• Set large mixed folders to Optimize for General items.
• Install the HEIF and HEVC extensions from the Store instead of codec packs.
• Import photos from cards and phones rather than browsing them directly.
• Unpin network folders you rarely use.
• Check drive health once or twice a year, and back up regularly.

None of these takes long, and together they keep File Explorer quick even with very large photo and video collections.

Ethan's sister added one more habit of her own: importing phone videos monthly instead of letting years pile up, which keeps each folder small.

Windows 10 differences

On Windows 10, Folder Options opens from View > Options, and the Preview and Details panes are on the View tab of the ribbon. Every fix here applies unchanged: restarting Explorer, thumbnails, folder types, Disk Cleanup, network fixes and drive checks. Windows 10 reached end of support in October 2025, but these steps still work on PCs that run it.

Windows 10's Disk Cleanup and Storage settings offer the same Thumbnails option for clearing the cache.

The Windows 10 ribbon's View tab also has a Panes group where the Preview and Details panes can be switched off with one click.

"The wait operation timed out": frequently asked questions

Ethan's sister's twelve years of photos open in a blink now, sorted by year, with one stubborn old video safely set aside. The scary-sounding error turned out to be File Explorer waiting politely for a file that would never answer. That is usually the story: not a dying PC, but one slow or broken thing that Explorer tries to read. Find it with the quick tests here, and the folder that froze becomes a folder you open without thinking.

Revision note. Written October 2, 2026, rewriting our 2017 fix into a full guide for every cause of this File Explorer error. May every folder open the moment you click it.